New Express Lane Planned for Northbound I-680
Published Date: 1/28/2026
Notice
Summary
Caltrans is moving forward with building a new express lane on northbound Interstate 680 in Contra Costa County, California, plus some ramp upgrades and lane conversions. This project affects drivers in the area by aiming to ease traffic and improve travel times. If anyone wants to challenge these decisions, they must do so by June 29, 2026, or lose their chance.
Analyzed Economic Effects
2 provisions identified: 1 benefits, 1 costs, 0 mixed.
I-680 Northbound Express Lane Built
Caltrans will build a northbound express lane on Interstate 680 in Contra Costa County from postmile 10.7 to postmile 23.1, with a 2-mile gap at the State Route 24 interchange. The project also adds braided ramps at Treat Boulevard and converts the existing high-occupancy vehicle (HOV) lane from State Route 242 to north of Arthur Road into an express lane; it is intended to ease traffic and improve travel times for drivers in the area.
Deadline to Challenge Project Decisions
If you want to challenge the federal approvals for the I-680 project, you must file a claim seeking judicial review on or before June 29, 2026 or your claim will be barred. If a federal law gives a shorter time period (less than 150 days), that shorter deadline applies instead.
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